Ecological Studies on Blister Blight and Japanese Exobasidium Blight of Tea (Part 1)
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概要
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1. Since 1954 the author has investigated some ecological characters of blister blight (Exobasidium vexans MASS.) and Japanese Exobasidium blight (=net-blister blight) (E. reticulatum ITO et SAW.) of tea, both of which are the members of the most serious tea diseases in Japan.<BR>2. Primary symptoms of blister blight were found on 1st to 4th opened leaves from the top, while those of Japanese Exobasidium blight were on 5th to 9th: the latter appeared on rather older leaves than the former.<BR>3. Inoculation experiments showed that the invasion of the blister blight fungus occurred only when the leaf tissue was very young.Usually, 3rd opened leaf or more older one did not permit the invasion of this fungus.<BR>4. From April to July, 1954, the relation between the climatic condition and the outbreak of blister blight was examined in the field. The conclusion was that the temperature range favourable to this disease was 15-22°C (daily average), and that the most responsible factor for the sudden outbreak was the long duration of high humidity and lack of sunlight in the period preceding the outbreak, when the causal fungus invaded the host tissues.<BR>5. Field observations from March to June, 1955, proved that the Japanese Exobasidium blight fungus overwintered in the living leaf tissue around the dead area attacked in the last season. Though the majority of such diseased leaves died and fell off in winter and spring, the remained ones newly beared white, reticulated hymenia of the causal fungus in May and June, when the daily average temperature rised above 14°C.
- 日本茶業技術協会の論文
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関連論文
- Tea Yellowa and its Graft Transmission
- Host Range of Cephaleuros virescens KUNZE
- Ecological Studies on Blister Blight and Japanese Exobasidium Blight of Tea (Part 1)
- Control of Tea Blister Blight with Various Fungicides (Part 2 )